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A lake has a steady-state pollution concentration of 50 mg/L and is being fed by a stream with flow rate 50m3/day. The volume of the lake is 1.00 x 10^7 m3, and the decay rate for the pollutant is 0.15/day. If the concentration of pollutant in the incoming stream suddenly dropped to zero (the factory releasing the pollutant had shut down), how long will it take the concnetration of pollutant in the lake to become half what it is presently? [The incoming stream is still flowing at its present rate].
A boad initially stationary at water,fires a shell in i direction,The shell's air speed =822 m/s.The shell was in the gu8n for .16s, and the force exerted on the shell decrease linearly fromthe initial force to zero over the firing interval.
Using Darcy's Law, calculate the quantity of groundwater (L/day), the seepage velocity (m/s), and the contaminant loading (Kg/day) to the river (assuming no retardation) for the following scenario. Be sure to include both a plane view and cross-se..
The road has 12-ft lanes. Due toexpensive excavation, it is determined that a maximumof 34 ft can be cleared from the road's centerline toward the inside lane to provide for stopping sight distance.
A paved parking lot section has a uniform slope over a length of 100 m (in the flow direction) from the point of a drainage area divide to the inlet grate, which extends across the lot width of 30 m.
Determine the gravitational force acting between two spheres that are touching each other. The mass of each sphere is 400 kg and the radius is 300mm.
The rigid bar AD is supported by two steel wires of (1/16)" diameter (E=29x10^6 psi) and a pin and bracket at D. Knowing that the wires were initially taut, determine (a) the additional tension in each wire when a 120-lb load P is applied at B
A simply supported beam is to span 12 feet. It will support a uniformly distributed load of 800 pounds per linear foot over the full span and a concentrated load of 1000 pounds acting at 4 feet from the left support.
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
A very small country has just gained independence in the year 2000, at which time its population was 1,000. The new country has a birth rate of 0.02 yr-1, death rate of 0.004 yr-1, immigration rate of 0.01 yr-1, and emigration rate of 0.005 yr-1.
A MH at an intersection has an inflow from three 8-inch PVC (n = 0.01) sanitary sewer pipes laid at minimum slope converging at an intersection and one pipe taking the flow from those three further downstream.
Section 604 of the act lists the phase-out of production of substances that deplete the ozone layer. What is the last year that carbon tetrachloride can be produced
A body with a mass of 250 kg is supported by the flexible cable system. Determine by analysis which of the cable A, B, C, or D has the largest tension.
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